Desa GWP30T, GWP20T, GWN20T, WMN20, GN30T Connecting to GAS Supply, Typical Inlet Pipe Diameters

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INSTALLATION

Continued

CONNECTING TO GAS SUPPLY

WARNING: This appliance requires a 3/8" NPT (National Pipe Thread) inlet connection to the pressure regulator.

WARNING: A qualified ser- vice person must connect heater to gas supply. Follow all local codes.

WARNING: For natural gas, never connect heater to private (non-utility) gas wells. This gas is commonlyknownaswellheadgas.

IMPORTANT: For natural gas, check gas line pressure before connecting heater to gas line. Gas line pressure must be no greater than 14 inches of water. If gas line pressure is higher, heater regula- tor damage could occur.

CAUTION: For propane/LP gas,neverconnectheaterdirectly to the propane/LP supply. This heater requires an external regu- lator (not supplied). Install the external regulator between the heater and propane/LP supply.

For propane/LP gas, the installer must supply an external regulator. The external regulator will re- duce incoming gas pressure. You must reduce in- coming gas pressure to between 11 and 14 inches

CAUTION: Use only new, black iron or steel pipe. Inter- nally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of large enough diameter to allow proper gas volume to heater. If pipe is too small, undue loss of volume will occur.

Typical Inlet Pipe Diameters

20,000 Btu/Hr Models - 3/8" or greater

30,000 Btu/Hr Models - 1/2" or greater

Installation must include equipment shutoff valve, union, and plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see Figure 15, page 13). IMPORTANT: Install an equipment shutoff valve in an accessible location. The equipment shutoff valve is for turning on or shutting off the gas to the appliance.

Apply pipe joint sealant lightly to male NPT threads. This will prevent excess sealant from go- ing into pipe. Excess sealant in pipe could result in clogged heater valves.

WARNING: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.

Install sediment trap in supply line as shown in Figure 15, page 13. Locate sediment trap where it is within reach for cleaning. Locate sediment trap where trapped matter is not likely to freeze. A sedi- ment trap traps moisture and contaminants. This keeps them from going into heater controls. If sedi- ment trap is not installed or is installed wrong, heater may not run properly.

of water. If you do not reduce incoming gas pres- sure, heater regulator damage could occur. Install the external regulator with the vent pointing down as shown in Figure 14. Pointing the vent down protects it from freezing rain or sleet.

Propane/LP Supply Tank

External Regulator

Vent

Pointing

Down

Figure 14 - External Regulator With Vent

Pointing Down

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Contents What to do if YOU Smell GAS Table of Contents Safety Information Product Features Local CodesProduct Identification UnpackingAIR for Combustion Ventilation Providing Adequate VentilationUnusually Tight Construction Confined and Unconfined SpaceDetermining FRESH-AIR Flow for Heater Location Determining if You Have a Confined or Unconfined SpaceInstallation Ventilation AIRCheck GAS Type Ventilation Air From Inside BuildingInstallation Items Locating HeaterInstalling Heater to Wall 20,000 Btu/Hr Models Attaching To Wall Anchor MethodPlacing Heater On Mounting Bracket Installing Bottom Mounting Screws Mounting Base Feet to Floor Where required by local codeMounting Heater to Floor with Optional Floor KIT Mounting Base Feet to HeaterConnecting to GAS Supply Typical Inlet Pipe DiametersChecking GAS Connections Natural GasPropane/LP Pressure Testing Heater Gas Connections Open equipment shutoff valve see ,Manual Control Models For Your Safety Read Before Lighting Operating HeaterLighting Instructions Manual Lighting Procedure To Turn OFF GAS To ApplianceShutting Off Heater Shutting Off Burner Only pilot stays litThermostat Control Operation Inpecting Heater Pilot Flame PatternBurner Flame Pattern Cleaning Maintenance ODS/PILOT and BurnerBurner Pilot AIR Inlet CabinetTroubleshooting Observed Problem Possible Cause RemedyReplace burner orifice See Cleaning and Mainte Gas leak. See Warning Statement aboveSpecifications GN30, GN30T WMN20, GWN20GP30, GP30T Service Hints Technical ServiceService Publications Replacement Parts Parts Under WarrantyIllustrated Parts Breakdown Parts List NJF 8CGWN20T, GWP20T GWN30T, GWP30T Parts List Accessories Equipment Shutoff Valve GA5010FAN Kits GA3250T Base KIT GA4550Parts Centrals Warranty Information Keep this WarrantyLimited Warranty VENT-FREE Residential GAS Heaters

GP30, GWN20T, GWN30T, GWN20, GWP20 specifications

Desa GWP20, GWP30T, GP30T, GN30T, and GP30 are advanced water heater models that stand out in the market for their efficiency, innovative technology, and user-friendly features. Each model is designed to cater to different consumer needs, offering reliable hot water solutions for residential and commercial applications.

The Desa GWP20 is a compact and efficient water heater that operates on a 20-gallon tank. Ideal for smaller households, it boasts fast heating capabilities and a durable construction that ensures longevity. Its user-friendly control panel allows for easy temperature adjustments, and its energy-saving mode helps reduce utility costs.

Moving up in capacity, the GWP30T features a 30-gallon tank, making it suitable for medium-sized households. This model incorporates a high-efficiency burner that maximizes heat output while minimizing gas consumption. With an upgraded insulation system, the GWP30T retains heat for longer periods, enhancing energy efficiency. The built-in diagnostics monitor performance, ensuring consistent operation and alerting users to any potential issues.

The GP30T is another 30-gallon model that emphasizes flexible installation options. It can be configured for various venting systems, making it adaptable for different home layouts. Its robust safety features, such as an automatic shut-off system, provide peace of mind for users. Additionally, the GP30T is equipped with a flame sensor for improved safety during operation.

For those seeking an efficient gas-powered unit, the GN30T delivers exceptional performance with a 30-gallon capacity. This model is designed to withstand the demands of larger households, featuring rapid recovery rates to provide a continuous supply of hot water. It utilizes advanced combustion technology that ensures efficient gas usage, striking the perfect balance between performance and energy costs.

Finally, the GP30 is a versatile water heater designed to meet diverse consumer needs. With a focus on sustainability, this model incorporates eco-friendly materials and technologies. The GP30 is packed with features that enhance its usability, such as customizable temperature settings, easy-to-read indicators, and a straightforward installation process.

In summary, Desa's GWP20, GWP30T, GP30T, GN30T, and GP30 water heaters are engineered for efficiency and reliability. Each model offers unique features tailored to specific user needs, from compact designs for smaller spaces to powerful systems for larger families. With an emphasis on modern technology and safety, Desa continues to be a leader in the water heating market.
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